xbee-api
Java API for communication with XBee/XBee-Pro series 1 (802.15.4) and series 2 (ZB/ZigBee Pro) OEM RF Modules. This has been on googlecode since 2007 and now in github. I will do my best to keep both repos in sync. See https://code.google.com/p/xbee-api/ for documentation.